| /* |
| * linux/fs/9p/vfs_file.c |
| * |
| * This file contians vfs file ops for 9P2000. |
| * |
| * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to: |
| * Free Software Foundation |
| * 51 Franklin Street, Fifth Floor |
| * Boston, MA 02111-1301 USA |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/fs.h> |
| #include <linux/file.h> |
| #include <linux/stat.h> |
| #include <linux/string.h> |
| #include <linux/smp_lock.h> |
| #include <linux/inet.h> |
| #include <linux/version.h> |
| #include <linux/list.h> |
| #include <asm/uaccess.h> |
| #include <linux/idr.h> |
| |
| #include "debug.h" |
| #include "v9fs.h" |
| #include "9p.h" |
| #include "v9fs_vfs.h" |
| #include "fid.h" |
| |
| /** |
| * v9fs_file_open - open a file (or directory) |
| * @inode: inode to be opened |
| * @file: file being opened |
| * |
| */ |
| |
| int v9fs_file_open(struct inode *inode, struct file *file) |
| { |
| struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
| struct v9fs_fid *v9fid, *fid; |
| struct v9fs_fcall *fcall = NULL; |
| int open_mode = 0; |
| unsigned int iounit = 0; |
| int newfid = -1; |
| long result = -1; |
| |
| dprintk(DEBUG_VFS, "inode: %p file: %p \n", inode, file); |
| |
| v9fid = v9fs_fid_get_created(file->f_dentry); |
| if (!v9fid) |
| v9fid = v9fs_fid_lookup(file->f_dentry); |
| |
| if (!v9fid) { |
| dprintk(DEBUG_ERROR, "Couldn't resolve fid from dentry\n"); |
| return -EBADF; |
| } |
| |
| if (!v9fid->fidcreate) { |
| fid = kmalloc(sizeof(struct v9fs_fid), GFP_KERNEL); |
| if (fid == NULL) { |
| dprintk(DEBUG_ERROR, "Out of Memory\n"); |
| return -ENOMEM; |
| } |
| |
| fid->fidopen = 0; |
| fid->fidcreate = 0; |
| fid->fidclunked = 0; |
| fid->iounit = 0; |
| fid->v9ses = v9ses; |
| |
| newfid = v9fs_get_idpool(&v9ses->fidpool); |
| if (newfid < 0) { |
| eprintk(KERN_WARNING, "newfid fails!\n"); |
| return -ENOSPC; |
| } |
| |
| result = |
| v9fs_t_walk(v9ses, v9fid->fid, newfid, NULL, NULL); |
| |
| if (result < 0) { |
| v9fs_put_idpool(newfid, &v9ses->fidpool); |
| dprintk(DEBUG_ERROR, "rewalk didn't work\n"); |
| return -EBADF; |
| } |
| |
| fid->fid = newfid; |
| v9fid = fid; |
| /* TODO: do special things for O_EXCL, O_NOFOLLOW, O_SYNC */ |
| /* translate open mode appropriately */ |
| open_mode = file->f_flags & 0x3; |
| |
| if (file->f_flags & O_EXCL) |
| open_mode |= V9FS_OEXCL; |
| |
| if (v9ses->extended) { |
| if (file->f_flags & O_TRUNC) |
| open_mode |= V9FS_OTRUNC; |
| |
| if (file->f_flags & O_APPEND) |
| open_mode |= V9FS_OAPPEND; |
| } |
| |
| result = v9fs_t_open(v9ses, newfid, open_mode, &fcall); |
| if (result < 0) { |
| dprintk(DEBUG_ERROR, |
| "open failed, open_mode 0x%x: %s\n", open_mode, |
| FCALL_ERROR(fcall)); |
| kfree(fcall); |
| return result; |
| } |
| |
| iounit = fcall->params.ropen.iounit; |
| kfree(fcall); |
| } else { |
| /* create case */ |
| newfid = v9fid->fid; |
| iounit = v9fid->iounit; |
| v9fid->fidcreate = 0; |
| } |
| |
| file->private_data = v9fid; |
| |
| v9fid->rdir_pos = 0; |
| v9fid->rdir_fcall = NULL; |
| v9fid->fidopen = 1; |
| v9fid->filp = file; |
| v9fid->iounit = iounit; |
| |
| return 0; |
| } |
| |
| /** |
| * v9fs_file_lock - lock a file (or directory) |
| * @inode: inode to be opened |
| * @file: file being opened |
| * |
| * XXX - this looks like a local only lock, we should extend into 9P |
| * by using open exclusive |
| */ |
| |
| static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) |
| { |
| int res = 0; |
| struct inode *inode = filp->f_dentry->d_inode; |
| |
| dprintk(DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); |
| |
| /* No mandatory locks */ |
| if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) |
| return -ENOLCK; |
| |
| if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { |
| filemap_fdatawrite(inode->i_mapping); |
| filemap_fdatawait(inode->i_mapping); |
| invalidate_inode_pages(&inode->i_data); |
| } |
| |
| return res; |
| } |
| |
| /** |
| * v9fs_read - read from a file (internal) |
| * @filep: file pointer to read |
| * @data: data buffer to read data into |
| * @count: size of buffer |
| * @offset: offset at which to read data |
| * |
| */ |
| |
| static ssize_t |
| v9fs_read(struct file *filp, char *buffer, size_t count, loff_t * offset) |
| { |
| struct inode *inode = filp->f_dentry->d_inode; |
| struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
| struct v9fs_fid *v9f = filp->private_data; |
| struct v9fs_fcall *fcall = NULL; |
| int fid = v9f->fid; |
| int rsize = 0; |
| int result = 0; |
| int total = 0; |
| |
| dprintk(DEBUG_VFS, "\n"); |
| |
| rsize = v9ses->maxdata - V9FS_IOHDRSZ; |
| if (v9f->iounit != 0 && rsize > v9f->iounit) |
| rsize = v9f->iounit; |
| |
| do { |
| if (count < rsize) |
| rsize = count; |
| |
| result = v9fs_t_read(v9ses, fid, *offset, rsize, &fcall); |
| |
| if (result < 0) { |
| printk(KERN_ERR "9P2000: v9fs_t_read returned %d\n", |
| result); |
| |
| kfree(fcall); |
| return total; |
| } else |
| *offset += result; |
| |
| /* XXX - extra copy */ |
| memcpy(buffer, fcall->params.rread.data, result); |
| count -= result; |
| buffer += result; |
| total += result; |
| |
| kfree(fcall); |
| |
| if (result < rsize) |
| break; |
| } while (count); |
| |
| return total; |
| } |
| |
| /** |
| * v9fs_file_read - read from a file |
| * @filep: file pointer to read |
| * @data: data buffer to read data into |
| * @count: size of buffer |
| * @offset: offset at which to read data |
| * |
| */ |
| |
| static ssize_t |
| v9fs_file_read(struct file *filp, char __user * data, size_t count, |
| loff_t * offset) |
| { |
| int retval = -1; |
| int ret = 0; |
| char *buffer; |
| |
| buffer = kmalloc(count, GFP_KERNEL); |
| if (!buffer) |
| return -ENOMEM; |
| |
| retval = v9fs_read(filp, buffer, count, offset); |
| if (retval > 0) { |
| if ((ret = copy_to_user(data, buffer, retval)) != 0) { |
| dprintk(DEBUG_ERROR, "Problem copying to user %d\n", |
| ret); |
| retval = ret; |
| } |
| } |
| |
| kfree(buffer); |
| |
| return retval; |
| } |
| |
| /** |
| * v9fs_write - write to a file |
| * @filep: file pointer to write |
| * @data: data buffer to write data from |
| * @count: size of buffer |
| * @offset: offset at which to write data |
| * |
| */ |
| |
| static ssize_t |
| v9fs_write(struct file *filp, char *buffer, size_t count, loff_t * offset) |
| { |
| struct inode *inode = filp->f_dentry->d_inode; |
| struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
| struct v9fs_fid *v9fid = filp->private_data; |
| struct v9fs_fcall *fcall; |
| int fid = v9fid->fid; |
| int result = -EIO; |
| int rsize = 0; |
| int total = 0; |
| |
| dprintk(DEBUG_VFS, "data %p count %d offset %x\n", buffer, (int)count, |
| (int)*offset); |
| rsize = v9ses->maxdata - V9FS_IOHDRSZ; |
| if (v9fid->iounit != 0 && rsize > v9fid->iounit) |
| rsize = v9fid->iounit; |
| |
| dump_data(buffer, count); |
| |
| do { |
| if (count < rsize) |
| rsize = count; |
| |
| result = |
| v9fs_t_write(v9ses, fid, *offset, rsize, buffer, &fcall); |
| if (result < 0) { |
| eprintk(KERN_ERR, "error while writing: %s(%d)\n", |
| FCALL_ERROR(fcall), result); |
| kfree(fcall); |
| return result; |
| } else |
| *offset += result; |
| |
| kfree(fcall); |
| |
| if (result != rsize) { |
| eprintk(KERN_ERR, |
| "short write: v9fs_t_write returned %d\n", |
| result); |
| break; |
| } |
| |
| count -= result; |
| buffer += result; |
| total += result; |
| } while (count); |
| |
| return total; |
| } |
| |
| /** |
| * v9fs_file_write - write to a file |
| * @filep: file pointer to write |
| * @data: data buffer to write data from |
| * @count: size of buffer |
| * @offset: offset at which to write data |
| * |
| */ |
| |
| static ssize_t |
| v9fs_file_write(struct file *filp, const char __user * data, |
| size_t count, loff_t * offset) |
| { |
| int ret = -1; |
| char *buffer; |
| |
| buffer = kmalloc(count, GFP_KERNEL); |
| if (buffer == NULL) |
| return -ENOMEM; |
| |
| ret = copy_from_user(buffer, data, count); |
| if (ret) { |
| dprintk(DEBUG_ERROR, "Problem copying from user\n"); |
| ret = -EFAULT; |
| } else { |
| ret = v9fs_write(filp, buffer, count, offset); |
| } |
| |
| kfree(buffer); |
| |
| return ret; |
| } |
| |
| struct file_operations v9fs_file_operations = { |
| .llseek = generic_file_llseek, |
| .read = v9fs_file_read, |
| .write = v9fs_file_write, |
| .open = v9fs_file_open, |
| .release = v9fs_dir_release, |
| .lock = v9fs_file_lock, |
| }; |